Treatment of refractory bricks.



UNTTED STATES PATENT OFFICE.

SYLVESTER ZUOKSCHWERDT, OF STASSFURT, GERMANY.

TREATMENT OF REFRACTORY BRICKS.

SPECIFICATION formingpart of Letters Patent No. 707,670, dated August26, 1902.

Application filed May 9, 1901. $erial No. 59,523. (No specimens.)

T0 (0Z5 whom, it may concern:

. Be it known that I, SYLVESTER ZUCK- SCHWERDT, a subject of the Emperorof Germany, and a resident of Stassfurt, Germany, have invented certainnew and useful Improvements in the Treatment of Refractory Bricks, ofwhich the following is a specification.

The object of this invention is to increase the refractory properties ofbaked bricks and the like of magnesia and clay, which is effected byfilling the pores and crevices of the said bricks or the like withmagnesia or alumina or a mixture thereof; The said bricks or the likeare saturated with a solution of magnesium chlorid or aluminium chloridor with a mixture thereof. When the said bricks or the like so saturatedare subjected to the heat which they are intended to withstand,decomposition of the salt or salts takes place and hydrochloric acid isgiven ofi, the magnesia or alumina remaining and filling the pores andcrevices, thereby increasing not only the refractory character of thebricks or the like, but also their imperviousness to gases and theirpower to resist the action of melting alkalies.

The process herein described of increasing the refractory properties ofbaked bricks and the like, which consists in saturating them with asolution of amagnesium chlorid, then subjecting them to the action ofheat to dissolve the salts and evolve the hydrochloric acid,substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SYLVESTER ZUCKSCHWERDT.

Witnesses:

HEINRICH ZoRIG, HEINRICH I'IARLAND.

